I have two variables that should not be entered if two other variables exist. I.e if B and C exist than D and E must be empty, or vis versa if D and E exist than B and C must be empty! I have tried using show and hide and that works fine until you go back and change one of the pairs without deleting the two other. An edit check that would not allow this would be welcome! I can easily check that after the fact but it is a common error so I would prefer preventing it during data entry:
Anyone with an idea???